GSG全集高清版第057集《线性工作流程》

What Is Linear Workflow

and How Can It Help Your Renders Look Better?

I wanted to start a conversation about Linear Workflow. It’s a topic that leaves a lot of people (including me) confused and asking a lot of questions. Why now? Well, with Cinema 4D version 12, linear workflow is turned on by default. And, with After Effects having linear workflow for a few years now, this is the perfect time to learn about LW and set up a true linear workflow for your renders. I have spent the last month doing a bit of research about working linearly and have tried to boil down where my mind is on the topic in the video above. I still have a lot to learn, but I figure we can start talking about it and learning from each other.

Why Bother?
You may be thinking, “Why should you go though all this hassle? My images looked fine before, why change now”? While linear workflow is a bit confusing at first, it will pay off BIG TIME in the long run. Your images will look more natural and your composites will be even easier. Besides, this is how computer graphics should have been in the first place. Computer graphics is relatively new and everything you know till now is a hack to make things work with antiquated technology. Linear workflow finally brings realistic light addition and falloff to your renders. The worst thing you can do is go back to your non-linear ways and pretend that linear just doesn’t exist. It’s here to help you. Hug and embrace linear workflow. It’s here to help, not to hurt.

Why Is This Crap So Confusing?
Learning about linear workflow gets confusing for a few reasons.

1. There are a lot of variables that go into a true linear workflow. Just flipping a button in your settings won’t do it. A true LW means that your images, video, textures, hdri images, renders, composites and effects must all be make linear and calculated linear at every step of the process. And since motion design and VFX is all about combining all of these different mediums, there is a lot of chance for error and confusion.

2. Computer monitors are lying to you. This means we have to apply a gamma curve to your final image to display it correctly on these screwed up monitors. The problem is, these gamma corrected images are then used in composites and not corrected back to linear before calculations are applied to them. When those images are RE-gamma corrected, the result is images that are too dark or to bright.

3. Before and after comparisons don’t do much to help explain what is happening behind the scenes. Sometimes scenes are darker with linear turned on, sometimes scenes get brighter. There just isn’t an easy visual way to explain it.

4. All your old tricks don’t work. With Linear workflow, things behave WAY differently. All of your old lighting, compositing and reflection tricks don’t work. Your old tricks are now broken because linear workflow calculates everything much differently. This is a big one for people and it’s a huge reason people have been shutting off linear workflow. Dont! Trust me, you don’t want to hold on to your old tricks. They were based on bad math. Linear workflow is here to make things easier, but it’s at the expense of your old tricks. [This is, by the way, why there are two rigs in the HDRI Light Kit Pro for many of the lights. One for working in linear and one for working non linear.]

How Can I Learn More?
There really isn’t a whole lot of information out there about Linear Workflow. I have found a few reliable resources that have helped me understand what linear is all about. Check out the links below to learn more about linear workflow.

【不专业翻译】

我想开始一个关于线性工作流程的谈话。它的一个话题，留下了很多迷茫，问了很多问题的人（包括我）。为什么是现在？C4D版本12，默认情况下，线性工作流程是打开。而且，AE已经有几年的线性工作流程，这是一个完美的的时机去了解LW并且为你的渲染呈现一个真实的线性工作流程。我花了上个月做一些研究工作线性，并试图归结在我的脑海里，也就是上面视频教程的主题。我仍然有很多东西要学，但我想，我们就可以开始谈论它和互相学习。

为何麻烦？

您可能会想，“为什么你自找烦恼呢？我的图片挺好，现在为什么要改变 ”？一开始，虽然线性工作流程有点“迷惑”，但是长远来说可以获得一个巨大的成功。您的图像显得更自然，合成将会更容易。此外，这是计算机图形学，摆在首位的。计算机图形学相对较新。目前，你所知道的是用较旧的技术处理工作的程序。线性工作流程，最终带来了真实的光，另外减少渲染。你能做的最糟糕的事情，就是回去，以非线性的方式，假装线性根本就不存在。在这里，以帮助您。拥抱，再拥抱线性工作流程。它的帮助，而不是痛苦。

这是为什么废话这么混乱？

学习线性工作流程变得混乱的几个原因。

1。成为一个真正的线性工作流程，有很多变数。如果你不想用它，只要点击设置中的一个按钮。一个真正的LW意味着，您的图像，视频，贴图，HDRI图像，渲染，合成和特效都必须进行线性和计算线性过程中的每一步。因为动作设计和特效技术是这些不同材料的结合，是有很多错误和混乱的机会。

2。计算机显示器是骗你。这意味着，我们不得不，给予最终的图像一个伽马曲线，在搞砸了的显示器上正确的显示。问题是，这些伽玛校正后的图像，然后在合成中使用，且在给予计算之前，不能修复成线性的。当这些图像重新伽玛校正，其结果是图像太暗或明亮。

3。之前和之后的比较，对解释场景背后发生了什么，没有多大的帮助。打开线性，有时候场景较深，有时候场景变亮。只是没有一个简单的可视化的方式来解释它。

4。你所有的技巧不奏效。线性工作流程，工作的行为方式不同。您的旧的灯光，合成和反射技巧都不起作用。现在你的技巧不能用了，因为线性工作流计算任何事都不同。对于人民来说，这是一个很大，也是一个巨大的原因，人们一直关闭的线性工作流程。不要！相信我，你不要一味的坚持自己的老方法。他们是基于坏的（劣质的）数学计算方式。线性工作流程，使事情变得更容易，但是牺牲你的老技巧。 [顺便说一下，这是为什么灯光插件会有两个配置。一个是线性，一个非线性工作] 。

我怎样才能了解更多？

现在真的没有一个系统的关于LW的知识。我找到几个可靠的资源，帮助我理解线性是什么。查看下面的链接了解更多的线性工作流程。

FX Guide Podcast with Master Zap
A Beginners Explanation of Gamma Correction and Linear Workflow in 3D PDF
A Beginners Explanation of Gamma Correction and Linear Workflow in 3D Video
A Great Collection of Linear Workflow Knowledge and Links by Stu Maschwitz

115下载

http://115.com/file/e7wz26mz#
061_What_Is_Linear_Workflow_and_How_Can_It_Help_Your_Renders_Look_Better【20101101】.rar

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